Half/Pack
®
Issued April 2018
Compressed Natural Gas (CNG) Option
Copyright 2018, Heil Environmental
Printed in the U.S.A.
Compressed Natural Gas (CNG) Option
185
CNG FUEL MODULE MAINTENANCE AND PART REPLACEMENT (CONTINUED)
D.Fuel Filter Replacement Procedure (Continued)
1. Follow instructions in Preparation before Maintenance to ensure pressure has been relieved
2. Locate the fuel filter inside the CNG module. Locate this fuel filter following directions in Compressed Natural Gas
(CNG) Fuel Module section.
3. The filter bowl is threaded into the filter housing.
4. Loosen filter housing with a 1-1/4” wrench or socket.
5. Remove filter bowl.
6. Grasp filter element, pulling downward to remove.
7. If filter comes apart upon removal from filter bowl, make sure plastic end is removed from filter bowl.
8. Install new element by pressing into place until it snaps into position.
9. Empty and clean filter bowl.
10.Discard old O-rings.
11.Apply approved lubricant (See Section B) to new O-rings and carefully install.
12.Place lubricant on filter housing threads.
13.Reinstall filter bowl in the filter housing and torque to 40 ft.-lbs.
14.Close the pressure bleed valve.
15.Open each tank’s valve.
16.Check the high pressure gauge to confirm increased fuel pressure.
Low pressure gauge may not register pressure until vehicle ignition is turned "ON".
E. Fuel Module Receptacle O-Ring Replacement Procedure
Figure 38. O-Ring Replacement Kit (Part Number 372-8386)
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